<template>

    <div class="app-container">

        <h2 style="text-align: center;">发布新课程</h2>

        <el-steps
            :active="2"
            process-status="wait"
            align-center
            style="margin-bottom: 40px;"
        >
            <el-step title="填写课程基本信息" />
            <el-step title="创建课程大纲" />
            <el-step title="最终发布    " />
        </el-steps>
        <el-button
            type="text"
            @click="dialogChapterFormVisible = true"
        >添加章节</el-button>
        <!-- 章节 -->
        <ul class="chanpterList">
            <li
                v-for="chapter in chapterNestedList"
                :key="chapter.id"
            >
                <p>
                    {{ chapter.name }}

                    <span class="acts">
                        <el-button
                            type="text"
                            @click="dialogVideoFormVisible = true; chapterId = chapter.id"
                        >添加课时</el-button>
                        <el-button
                            type="text"
                            @click="byid(chapter.id)"
                        >编辑</el-button>
                        <el-button
                            type="text"
                            @click="removeChapter(chapter.id)"
                        >删除</el-button>
                    </span>
                </p>

                <!-- 视频 -->
                <ul class="chanpterList videoList">
                    <li
                        v-for="video in chapter.children"
                        :key="video.id"
                    >
                        <p>{{ video.name }}
                            <span class="acts">
                                <el-button
                                    type="text"
                                    @click="byidVideoShow(video.id)"
                                >编辑</el-button>
                                <el-button
                                    type="text"
                                    @click="removeVideo(video.id)"
                                >删除</el-button>
                            </span>
                        </p>
                    </li>
                </ul>
            </li>
        </ul>
        <!-- 添加和修改章节表单 -->
        <el-dialog
            :visible.sync="dialogChapterFormVisible"
            title="添加章节"
        >
            <el-form
                :model="chapter"
                label-width="120px"
            >
                <el-form-item label="章节标题">
                    <el-input v-model="chapter.title" />
                </el-form-item>
                <el-form-item label="章节排序">
                    <el-input-number
                        v-model="chapter.sort"
                        :min="0"
                        controls-position="right"
                    />
                </el-form-item>
            </el-form>
            <div
                slot="footer"
                class="dialog-footer"
            >
                <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
                <el-button
                    type="primary"
                    @click="saveOrUpdate"
                >确 定</el-button>
            </div>
        </el-dialog>
        <!-- 添加和修改课时表单 -->
        <el-dialog
            :visible.sync="dialogVideoFormVisible"
            title="课时信息"
        >
            <el-form
                :model="video"
                label-width="120px"
            >
                <el-form-item label="课时标题">
                    <el-input v-model="video.title" />
                </el-form-item>
                <el-form-item label="课时排序">
                    <el-input-number
                        v-model="video.sort"
                        :min="0"
                        controls-position="right"
                    />
                </el-form-item>
                <el-form-item label="是否免费">
                    <el-radio-group v-model="video.isFree">
                        <el-radio :label="0">免费</el-radio>
                        <el-radio :label="1">默认</el-radio>
                    </el-radio-group>
                </el-form-item>
                <!-- TODO -->
                <!--上传视频-->
                <el-form-item label="上传视频">
                    <el-upload
                        :on-success="handleVodUploadSuccess"
                        :on-remove="handleVodRemove"
                        :before-remove="beforeVodRemove"
                        :on-exceed="handleUploadExceed"
                        :file-list="fileList"
                        :action="BASE_API+'/vodservice/video/uploadVideo'"
                        class="upload-demo"
                    >
                        <el-button
                            size="small"
                            type="primary"
                        >上传视频</el-button>
                        <el-tooltip placement="right-end">
                            <div slot="content">最大支持1G，<br>
                                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                            <i class="el-icon-question" />
                        </el-tooltip>
                    </el-upload>
                </el-form-item>
            </el-form>
            <div
                slot="footer"
                class="dialog-footer"
            >
                <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
                <el-button
                    :disabled="saveVideoBtnDisabled"
                    type="primary"
                    @click="saveOrUpdateVideo"
                >确 定</el-button>
            </div>
        </el-dialog>
        <div>
            <el-button @click="previous">上一步</el-button>
            <el-button
                :disabled="saveBtnDisabled"
                type="primary"
                @click="next"
            >下一步</el-button>
        </div>
    </div>
</template>
  
  <script>
import chapter from '@/api/chapter/chapter.js'
import { T } from 'caniuse-lite/data/browserVersions'
import video from '@/api/videoapi/video.js'
import vod from '@/api/vod/vod.js'

export default {
    data() {
        return {
            saveBtnDisabled: false, // 保存按钮是否禁用
            courseId: '', // 所属课程
            chapterNestedList: [], // 章节嵌套课时列表
            dialogChapterFormVisible: false, // 是否显示章节表单
            chapter: {
                // 章节对象
                title: '',
                sort: 0
            },
            saveVideoBtnDisabled: false, // 按钮是否禁用
            dialogVideoFormVisible: false, // 是否显示课时表单
            chapterId: '', // 课时所在的章节id
            video: {
                // 课时对象
                title: '',
                sort: 0,
                isFree: 0,
                videoSourceId: '',
                videoOriginalName: '' // 视频名称
            },
            fileList: [], // 上传文件列表
            BASE_API: process.env.BASE_API // 接口API地址
        }
    },
    // 初始化
    created() {
        // console.log('chapter created')
        if (this.$route.params && this.$route.params.id) {
            this.courseId = this.$route.params.id
            this.getAllchapter()
        }
    },
    methods: {
        //* ************************************小节上传视频操作******************************************* */
        // 成功回调
        handleVodUploadSuccess(response, file, fileList) {
            this.video.videoSourceId = response.data.videoid
            this.video.videoOriginalName = file.name
        },
        // 视图上传多于一个视频
        handleUploadExceed(files, fileList) {
            this.$message.warning('想要重新上传视频，请先删除已上传的视频')
        },
        // 删除之前
        beforeVodRemove(file, fileList) {
            return this.$confirm(`确定移除 ${file.name}？`)
        },
        // 删除
        handleVodRemove(file, fileList) {
            vod.deleteVideo(this.video.videoSourceId).then(response => {
                this.$message({
                    type: 'success',
                    message: response.message
                })
                this.video.videoSourceId = ''
                video.updateByVideo(this.video).then(response => {})
            })
        },
        //* ************************************小节操作******************************************* */
        removeVideo(id) {
            this.$confirm('此操作将永久删除该章节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            })
                .then(() => {
                    video
                        .delVideoByid(id)
                        .then(response => {
                            if (response.success === true) {
                                this.$message({
                                    type: 'success',
                                    message: '成功删除章节'
                                })
                                this.getAllchapter()
                            }
                        })
                        .catch(function(reason) {
                            alert('错误')
                        })
                })
                .catch(() => {
                    this.$message({
                        type: 'info',
                        message: '已取消删除'
                    })
                })
        },
        byidVideoShow(id) {
            video.byidVideo(id).then(response => {
                if (response.success === true) {
                    // 打开对话框
                    this.dialogVideoFormVisible = true
                    // 赋值
                    this.video = response.data.video

                    const url = response.data.url
                    if (url.length > 0 && url != null) {
                        this.fileList = [
                            {
                                name: this.video.videoOriginalName,
                                url: url
                            }
                        ]
                    }
                }
            })
        },
        saveOrUpdateVideo() {
            this.saveVideoBtnDisabled = false
            if (!this.video.id) {
                this.saveDataVideo()
            } else {
                this.updateDataVideo()
            }
        },

        saveDataVideo() {
            this.video.courseId = this.courseId
            this.video.chapterId = this.chapterId
            video.saveVideo(this.video).then(response => {
                if (response.success === true) {
                    // 关闭对话框
                    this.dialogVideoFormVisible = false
                    // 成功消息
                    this.$message({
                        type: 'success',
                        message: '保存小节成功!'
                    })
                    // 刷新页面
                    this.getAllchapter()
                }
            })
        },
        updateDataVideo() {
            video.updateByVideo(this.video).then(response => {
                if (response.success === true) {
                    // 关闭对话框
                    this.dialogVideoFormVisible = false
                    // 成功消息
                    this.$message({
                        type: 'success',
                        message: '修改小节成功!'
                    })
                    // 刷新页面
                    this.getAllchapter()
                }
            })
        },
        //* ************************************章节操作******************************************* */
        removeChapter(id) {
            this.$confirm('此操作将永久删除该章节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            })
                .then(() => {
                    chapter
                        .delChapterByid(id)
                        .then(response => {
                            if (response.success === true) {
                                this.$message({
                                    type: 'success',
                                    message: '成功删除章节'
                                })
                                this.getAllchapter()
                            }
                        })
                        .catch(function(reason) {
                            alert('错误')
                        })
                })
                .catch(() => {
                    this.$message({
                        type: 'info',
                        message: '已取消删除'
                    })
                })
        },
        savaData() {
            chapter
                .saveChapter(this.chapter)
                .then(response => {
                    // 成功
                    if (response.success === true) {
                        // 关闭弹窗
                        this.dialogChapterFormVisible = false
                        // 提示信息
                        this.$message({
                            type: 'success',
                            message: '添加章节成功'
                        })
                        // 刷新页面
                        this.getAllchapter()
                    }
                })
                .catch(function(reason) {
                    alert('错误')
                })
        },
        updateData() {
            chapter
                .updateByChapter(this.chapter)
                .then(response => {
                    // 成功
                    if (response.success === true) {
                        // 关闭弹窗
                        this.dialogChapterFormVisible = false
                        // 提示信息
                        this.$message({
                            type: 'success',
                            message: '修改章节成功'
                        })
                        // 刷新页面
                        this.getAllchapter()
                    }
                })
                .catch(function(reason) {
                    alert('错误')
                })
        },
        byid(chapterid) {
            chapter
                .byidChapter(chapterid)
                .then(response => {
                    // 成功
                    if (response.success === true) {
                        this.dialogChapterFormVisible = true
                        this.chapter = response.data.chapter
                    }
                })
                .catch(function(reason) {
                    alert('错误')
                })
        },
        // 添加章节小节
        saveOrUpdate() {
            if (!this.chapter.id) {
                // 给chapter设置courseId
                this.chapter.courseId = this.courseId
                this.savaData()
            } else {
                this.updateData()
            }
        },
        // 根据课程id查询章节和小节
        getAllchapter() {
            chapter
                .getAllChapter(this.courseId)
                .then(response => {
                    // 成功
                    if (response.success === true) {
                        this.chapterNestedList = response.data.chapters
                    }
                })
                .catch(function(reason) {
                    alert('错误')
                })
        },
        previous() {
            // console.log('previous')
            this.$router.push({ path: '/course/info/' + this.courseId })
        },

        next() {
            // console.log('next')
            this.$router.push({ path: '/course/publish/' + this.courseId })
        }
    },
    watch: {
        dialogChapterFormVisible() {
            if (this.dialogChapterFormVisible === false) {
                this.chapter.title = ''
                this.chapter.sort = 0
            }
        },
        dialogVideoFormVisible() {
            if (this.dialogVideoFormVisible === false) {
                this.video.title = ''
                this.video.id = ''
                this.video.sort = 0
                this.video.videoSourceId = ''
                this.video.videoOriginalName = ''
                this.fileList = []
            }
        }
    }
}
</script>
<style scoped>
.chanpterList {
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li {
    position: relative;
}
.chanpterList p {
    float: left;
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #ddd;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList {
    padding-left: 50px;
}
.videoList p {
    float: left;
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #ddd;
}
</style>
